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Deferred Acquisition Costs and Other Actuarial Balances - Benefits and Protection - Balances and changes in DAC (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | $ 3,950.5 |  |
Amortized to expense | (392.5) | $ (389.8) | $ (386.9)
Ending balance, Deferred acquisition costs | 4,006.9 | 3,950.5 |
Benefits and Protection |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 3,023.9 |  |
Amortized to expense | (296.2) | (292.9) | (284.8)
Ending balance, Deferred acquisition costs | 3,043.8 | 3,023.9 |
Individual disability | Benefits and Protection | Specialty Benefits |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 667.7 | 626.1 |
Costs deferred | 79.0 | 86.7 |
Amortized to expense | (49.8) | (45.1) |
Ending balance, Deferred acquisition costs | 696.9 | 667.7 | 626.1
Universal life | Benefits and Protection | Life Insurance |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 1,545.3 | 1,569.7 |
Costs deferred | 76.7 | 70.7 |
Amortized to expense | (94.3) | (95.1) |
Ending balance, Deferred acquisition costs | 1,527.7 | 1,545.3 | 1,569.7
Term life | Benefits and Protection | Life Insurance |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 695.1 | 685.7 |
Costs deferred | 78.3 | 71.3 |
Amortized to expense | (62.6) | (61.9) |
Ending balance, Deferred acquisition costs | 710.8 | 695.1 | 685.7
Participating life | Benefits and Protection | Life Insurance |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 84.7 | 93.0 |
Costs deferred | 1.7 | 1.4 |
Amortized to expense | (8.6) | (9.7) |
Ending balance, Deferred acquisition costs | $ 77.8 | $ 84.7 | $ 93.0

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